Introduction
If you have a shaded corner of your yard that needs a splash of color, begonias are the perfect solution. These versatile plants are beloved for their ability to thrive where many other flowers struggle, offering vibrant blooms and spectacular foliage from early summer right through the first frost. At Longfield Gardens, we enjoy helping gardeners discover how easy it is to transform a dim patio or a leafy garden bed into a lush, flowering retreat using these tropical treasures, and our begonia collection is a great place to start.
This guide is designed for home gardeners who want to master the basics of begonia care, whether you are starting with tubers in the spring or looking to maintain healthy foliage plants year-round. We will cover everything from selecting the right varieties to the simple steps for planting and overwintering. For a broader overview of the basics, our begonia plant guide is a helpful companion read.
Growing begonias is a rewarding experience that rewards a little bit of patience with a huge payoff in visual interest. With the right site and a consistent watering routine, you can grow begonias that look like they belong in a professional botanical display.
Understanding the Different Types of Begonias
Before you dig into the soil, it is helpful to know which type of begonia you are growing. While there are thousands of species, most home gardeners choose from a few primary groups. Each group has slightly different needs and growth habits.
Tuberous Begonias
These are the superstars of the shade garden. Tuberous begonias grow from a thick, potato-like underground stem called a tuber. They are famous for their large, rose-like flowers that come in brilliant shades of red, orange, yellow, pink, and white. For more detailed growing advice, see our Tips for Growing Tuberous Begonias.
Wax Begonias
If you have ever seen a tidy row of pink or red flowers edging a park walkway, you were likely looking at wax begonias. These are fibrous-rooted plants with succulent, waxy leaves that can be green or bronze. They are incredibly hardy and can handle more sun than most other types.
Rex Begonias
Rex begonias are grown primarily for their foliage rather than their flowers. Their leaves are works of art, featuring swirls of silver, purple, burgundy, and emerald green. While they are often grown as houseplants, they make excellent "thriller" plants in shaded outdoor containers during the summer months.
Cane and Rhizomatous Begonias
Cane begonias, often called "Angel Wing" begonias, have tall, upright stems that resemble bamboo. They produce clusters of drooping flowers and often have silver-spotted leaves. Rhizomatous begonias grow from thick stems that creep along the soil surface. Both are common as houseplants but enjoy a summer vacation in a shaded spot outdoors.
Key Takeaway: Match the begonia type to your garden goal. Choose tuberous begonias for big, showy blooms in containers, and wax begonias for reliable color in garden borders.
Choosing the Perfect Planting Site
Success with begonias starts with "right plant, right place." Because they are native to tropical and subtropical regions, they have specific preferences for light and temperature. Our Where to Plant Begonias: Sun or Shade? guide can help you narrow down the best spot.
Light Requirements
Most begonias prefer partial shade or filtered light. Direct afternoon sun in hot climates can scorch the leaves and cause the flowers to wilt. A spot that gets gentle morning sun and afternoon shade is usually ideal.
- Wax Begonias: These are the most sun-tolerant and can handle full sun in cooler northern climates if they receive plenty of water.
- Tuberous and Rex Begonias: These need protection from the heat. Dappled light under a tree or a covered porch is perfect.
Soil and Drainage
Begonias need soil that stays moist but never stays soggy. "Drainage" refers to how quickly water moves through the soil. If water sits in a puddle for hours after a rain, the roots or tubers may rot. For more on soil setup, see our Best Growing Conditions for Begonias guide.
- In the Garden: Amend heavy clay soil with compost or peat moss to improve the texture and drainage.
- In Containers: Always use a high-quality, soil-less potting mix. These mixes are designed to hold onto the right amount of moisture while letting the excess drain away.
Temperature and Airflow
Begonias are tropical plants and do not like the cold. Wait until the soil is warm and nighttime temperatures are consistently above 60°F before moving them outdoors. They also appreciate good airflow, which helps prevent fungal issues like powdery mildew. Avoid crowding them too closely together in humid climates.
How to Grow Begonia Plant from Tubers
Starting with tubers is an affordable and satisfying way to grow begonias. While you can plant them directly outdoors once the weather warms, many gardeners prefer to "wake them up" indoors to get a head start on the blooming season.
Starting Tubers Indoors
We recommend starting your tubers about 8 to 12 weeks before the last expected frost in your area.
- Find the Indent: Begonia tubers have a slightly hollow or indented side. This is the top where the sprouts will emerge. The rounded side is the bottom.
- Use Shallow Trays: Fill a tray with moist potting soil.
- Place the Tubers: Set the tubers on the soil surface with the indented side facing up. Press them in slightly, but do not bury them deep. A light dusting of soil over the top is enough.
- Keep Warm and Moist: Place the tray in a warm spot (around 70°F) with bright, indirect light. Water sparingly—just enough to keep the soil from drying out—until you see green sprouts.
Transplanting to the Garden
Once the sprouts are a few inches tall and the outdoor weather is warm, it is time to move them to their permanent home.
- Spacing: Plant tubers 8 to 12 inches apart to allow for mature growth.
- Depth: Dig a hole so the top of the tuber is about 1 inch below the soil surface.
- Handle with Care: The stems and leaves of begonias are succulent and can snap easily. Handle the plants gently during the move.
What to Do Next
- Check the 10-day weather forecast for any late-season cold snaps.
- Prepare your containers with fresh potting soil and slow-release fertilizer.
- Water the tubers lightly immediately after transplanting to settle the soil.
Watering and Feeding for Maximum Blooms
Begonias have a reputation for being fussy about water, but they are actually quite predictable once you understand their needs. The goal is "consistent moisture."
The "Touch Test" for Watering
Instead of watering on a strict schedule, use your finger to check the soil. If the top inch feels dry, it is time to water. If it still feels damp, wait a day or two.
- Water the Soil, Not the Leaves: Aim the water at the base of the plant. Wet leaves can lead to spotting or fungal diseases.
- Morning is Best: Watering in the morning allows any splashes on the foliage to dry out during the day.
- Container Care: Plants in pots and hanging baskets dry out much faster than those in the ground. During a hot summer stretch, you may need to check container begonias every day.
Fertilizing Basics
Because begonias bloom so prolifically, they need a steady supply of nutrients.
- At Planting: Mix a slow-release granular fertilizer into the soil. This provides a "baseline" of food for several months.
- During the Season: For the best floral display, use a water-soluble fertilizer formulated for flowering plants every two to four weeks. Always follow the instructions on the product label for the correct dilution.
Key Takeaway: Begonias prefer being slightly underwatered rather than overwatered. If the soil stays saturated, the stems can become mushy, so always ensure your pots have drainage holes.
Grooming and Maintenance Tips
One of the best things about most modern begonias is that they are "self-cleaning." This means the old flowers fall off on their own, so you do not have to spend hours deadheading (removing spent blooms) to keep the plant looking tidy.
Pinching for Fullness
If your begonias are looking "leggy"—meaning they have long, thin stems with few leaves—you can encourage them to branch out by pinching. Use your thumb and forefinger to snip off the very tip of a growing stem. The plant will respond by growing two new stems from that point, resulting in a bushier, fuller plant with more flowers.
Managing Pests and Diseases
Begonias are generally sturdy, but they can occasionally run into trouble.
- Powdery Mildew: This looks like a dusting of white flour on the leaves. It usually happens when there is high humidity and poor airflow. Space plants out and try to keep the leaves dry.
- Slugs and Snails: These garden visitors love the juicy leaves of begonias. If you notice holes in the foliage, you can use organic slug bait or physical barriers to protect your plants.
Growing Begonias in Containers and Hanging Baskets
Begonias are practically made for container gardening. Their vibrant colors and varied textures make them the perfect "filler" or "spiller" in a decorative arrangement.
Choosing the Right Pot
- Size Matters: A pot that is too small will dry out too quickly and restrict root growth. For a single tuberous begonia, a 10-inch pot is a good starting point. For a standard hanging basket, three plants will create a full, lush look.
- Material: Terra cotta pots are breathable and help prevent overwatering, but they dry out fast. Plastic or glazed ceramic pots hold moisture longer, which can be helpful for shade-loving plants.
Design Ideas
- The Monochromatic Look: Plant several shades of the same color (like light pink, rose, and deep red) for a sophisticated, tonal effect.
- Contrast with Foliage: Pair the bright blooms of a tuberous begonia with the silver leaves of a Rex begonia or the trailing vines of a sweet potato vine.
- The Shady Trio: Combine begonias with other shade-loving favorites like coleus, fuchsia, or caladiums for a container that thrives all summer long.
Action List for Containers
- Select a pot with at least one large drainage hole.
- Use fresh, high-quality potting mix (not garden soil).
- Add a layer of mulch or moss to the top of the soil to help retain moisture.
- Rotate the pot occasionally so all sides of the plant get equal light.
Overwintering Begonias for Next Year
Since begonias are tropical, they will not survive a freeze. However, you do not have to buy new plants every year. You can save your tubers and even your wax or Rex begonias to enjoy again next season. If you want a broader look at keeping plants going indoors, see our How Long Do Begonias Last Indoors? guide.
Saving Tuberous Begonias
When the leaves begin to yellow in the fall or after the first light frost, it is time to bring the tubers inside.
- Lift the Tubers: Carefully dig up the tubers or remove them from their pots.
- Dry Them Out: Cut back the stems to about an inch and let the tubers sit in a dry, shady spot for a few days until the outer skin dries.
- Store for Winter: Place the tubers in a paper bag or a box filled with dry peat moss, sawdust, or vermiculite.
- The Ideal Environment: Store them in a cool, dark, and dry place (like a basement or crawlspace) where the temperature stays around 40°F to 50°F. Do not let them freeze.
Moving Foliage Begonias Indoors
Wax, Rex, and Cane begonias can be transitioned into houseplants for the winter.
- The Move: Bring them inside before the nighttime temperatures drop below 50°F.
- The Adjustment: They may drop a few leaves as they adjust to the lower light and drier air of your home.
- Winter Care: Reduce watering and stop fertilizing during the winter months. Place them near a bright window, but away from drafty doors or heating vents.
Conclusion
Learning how to grow begonia plants is one of the easiest ways to bring professional-level beauty to your home garden. By matching the right variety to your light conditions and keeping the soil consistently moist, you can enjoy months of spectacular color. Whether you prefer the giant, rose-like blooms of tuberous varieties or the intricate patterns of Rex foliage, these plants are sure to become a favorite in your summer landscape.
At Longfield Gardens, we take pride in providing high-quality tubers and plants that help you garden with confidence. Remember these simple steps for success:
- Start tubers indoors for an early bloom season.
- Protect plants from hot afternoon sun.
- Water the soil, not the leaves, to keep plants healthy.
- Save your tubers in the fall to enjoy them year after year.
"Gardening is a journey of discovery. With begonias, the reward is a lush, colorful sanctuary that thrives in the quiet, shaded corners of your world."
We invite you to explore our selection and start your own begonia tradition this spring. With just a little care, your garden will be glowing with color in no time.
FAQ
Which side of a begonia tuber should be planted facing up?
The side with the hollow or indented center should face up. This is where the new leaf and flower stems will sprout. The rounded, smooth side is the bottom where the roots will develop.
Can begonias grow in full sun?
Most begonias prefer partial shade, but wax begonias are quite sun-tolerant. In cooler northern climates, wax begonias can handle full sun if they are kept well-watered. Tuberous and Rex begonias almost always require shade or filtered light to prevent leaf scorch.
Why are my begonia leaves turning yellow and mushy?
Yellow, mushy stems and leaves are usually a sign of overwatering or poor drainage. Begonias are susceptible to root rot if they sit in waterlogged soil. Make sure your pots have drainage holes and allow the top inch of soil to dry out before watering again.
Do I need to remove the dead flowers from my begonias?
Most modern begonia varieties are "self-cleaning," meaning the old blooms fall off on their own. You do not need to deadhead them to keep the plant blooming. However, removing any fallen debris from the top of the soil can help prevent mold and keep the plant looking tidy.
